Why the fuck anyone would let someone, with absolutely no medical training, inject something into them is beyond me.

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Because people with medical training by and large wouldn't inject unnecessary substances into anyone.
If they will they should be struck off. Cosmetic surgeons should be struck off in my opinion, well the money chasing vanity purveyors anyway. They should have to have a psychiatrists letter for any procedure that isn't to rectify actual disfigurement.